Ransomware Hit Disrupts Real Estate Property Listings in US. Property listings nationwide are being disrupted due to an apparent ransomware attack against California-based Rapattoni, which hosts Multiple Listing Services used. Property listings nationwide are being disrupted due to an apparent ransomware attack. Real estate agents’ ability to list or update property information has been compromised by an attack on California-based data services company Rapattoni, which hosts multiple listing services. Third-party company: Rapattoni Corporation.